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Effect of Concentration On Reaction Time Reaction 1:: Mixture # 5

1. The document describes experiments measuring the effect of concentration, temperature, and catalysts on the reaction rate of an iodine clock reaction between iodide and peroxydisulfate ions. 2. For concentration, graphs of reaction time vs. iodide concentration and peroxydisulfate concentration show the reaction is first order with respect to both reactants. 3. Increasing temperature from room temperature to 90°C decreases reaction time, indicating temperature has a positive effect on reaction rate. 4. Catalyst trials show MnCl2 and MnO2 decrease reaction time the most, meaning they are the most active catalysts for this reaction.

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70 views5 pages

Effect of Concentration On Reaction Time Reaction 1:: Mixture # 5

1. The document describes experiments measuring the effect of concentration, temperature, and catalysts on the reaction rate of an iodine clock reaction between iodide and peroxydisulfate ions. 2. For concentration, graphs of reaction time vs. iodide concentration and peroxydisulfate concentration show the reaction is first order with respect to both reactants. 3. Increasing temperature from room temperature to 90°C decreases reaction time, indicating temperature has a positive effect on reaction rate. 4. Catalyst trials show MnCl2 and MnO2 decrease reaction time the most, meaning they are the most active catalysts for this reaction.

Uploaded by

dat123
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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1. EFFECT OF CONCENTRATION ON REACTION TIME

Reaction 1:
__________________________________________________

Reaction 2:
__________________________________________________
Calculate the initial concentrations of I - and S2O82- ions:
Mixture # 5:

[I-] =

[S2O82-] =

Mixture Iodide ion Peroxydisulfate Time in seconds


1 0.08 0.04
2 0.068 0.04
3 0.056 0.04
4 0.044 0.04
5 0.032 0.04
6 0.02 0.04
Mixture Iodide ion Peroxydisulfate Time in seconds
7 0.08 0.034
8 0.08 0.028
9 0.08 0.022
10 0.08 0.016
11 0.08 0.01

1
2

Plotting the concentration of iodide ion versus time: [Note: X – axis: time; Y – axis:
concentrations].
- Mixtures # 1-6: Graph

The order of reaction with respect to iodide ion?.

Comments:

2
3

- Mixtures # 1, 7, 8, 9, 10, and 11: Graph

The order of reaction with respect to peroxydisulfate ion ?.

Comments:

2. EFFECT OF TEMPERATURE ON THE REACTION RATE


3
4

Reaction System:

Description of Predicted Observation Reaction Explanation


conditions outcome time

Room
temperature

500C

900C

Comment:

3. EFFECT OF A CATALYST ON THE REACTION RATE (30 pts)

Reaction System:

Trial Description of Predicted Observation Explanation


conditions outcome (Reaction rate)
1 + MnCl2

2 + MnO2

3 + NaCl

4 + CaCl2

5 + Zn

6 + KNO3

7 + Fe(NO3)3

The order of catalyst activity:

4
5

Comments:

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